SceneKit iOS 13.0 Beta 1 to Beta 2 API Differences

SCNMaterial.h
Added SCNLightingModelShadowOnly
SCNParticleSystem.h
Declaration
From@property (nonatomic, unsafe_unretained) SCNNode *inputOrigin
To@property (nonatomic, weak) SCNNode *inputOrigin

SCNSceneRenderer.h
Declaration
From@property (nonatomic, unsafe_unretained) id<SCNSceneRendererDelegate> delegate
To@property (nonatomic, weak) id<SCNSceneRendererDelegate> delegate